为什么我的 JComponent 没有显示在背景 JFrame 的顶部？
请检查以下代码：
class CounterFrame extends JFrame {
/**
*
*/
private static final long serialVersionUID = 1L;
private MyPanel myComponent = new MyPanel();
private JLabel contentPane = new JLabel(new ImageIcon(getClass()
.getResource("background/2.jpg")));
CounterFrame() {
contentPane.setLayout(new GridBagLayout());
setContentPane(contentPane);
add(myComponent);
}
}
class MyPanel extends JPanel {
/**
*
*/
private static final long serialVersionUID = 1L;
private Font myFont;
private String target;
private String raised = "200000";
private Image background;
public MyPanel() {
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D twoD = (Graphics2D) g;
RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
twoD.setRenderingHints(rh);
File f = new File("fonts/event.ttf");
try {
myFont = Font.createFont(Font.TRUETYPE_FONT, f);
myFont = myFont.deriveFont(90f);
} catch (FontFormatException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
twoD.setColor(Color.BLACK);
twoD.setFont(myFont);
twoD.drawString(raised,5, 90);
}
}
似乎在这里工作正常（在代码的 SSCCE 变体中）。
import java.awt.*;
import javax.swing.*;
import java.net.URL;
class CounterFrame extends JFrame {
private static final long serialVersionUID = 1L;
private MyPanel myComponent = new MyPanel();
private JLabel contentPane;
CounterFrame() {
try {
URL url = new URL("http://pscode.org/media/stromlo2.jpg");
contentPane = new JLabel(new ImageIcon(url));
} catch(Throwable t) {
t.printStackTrace();
}
contentPane.setLayout(new GridBagLayout());
setContentPane(contentPane);
add(myComponent);
}
public static void main(String[] args) {
//Create the frame on the event dispatching thread
SwingUtilities.invokeLater(new Runnable(){
@Override
public void run() {
CounterFrame rc = new CounterFrame();
rc.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
rc.pack();
rc.setVisible(true);
}
});
}
}
class MyPanel extends JPanel {
private static final long serialVersionUID = 1L;
private String target;
private String raised = "200000";
private Image background;
public MyPanel() {
setPreferredSize(new Dimension(200,100));
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
Graphics2D twoD = (Graphics2D) g;
RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
rh.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
twoD.setRenderingHints(rh);
twoD.setColor(Color.BLACK);
twoD.drawString(raised,5, 90);
}
}
我能从中得出的唯一结论是：
- 找不到您的资源。
- 您需要学习基本的调试技能。在这种情况下，具体来说是“检查每个步骤中发生的事情实际上是否有效的假设”。如下所示的“三级”语句应分解为 3 个语句，您可以使用以下命令检查 3 个结果中的每一个
System.out.println()或调试器。
调试不友好！
new JLabel(new ImageIcon(getClass()
.getResource("background/2.jpg")));
以及未来的注释。为了更快地获得更好的帮助，请发布SSCCE http://sscce.org/.
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